Source : Webster's Revised Unabridged Dictionary (1913)

Palpable \Pal"pa*ble\, a. [F. palpable, L. palpabilis, fr.
   palpare to feel, stroke; cf. palpus the soft palm of the
   hand.]
   1. Capable of being touched and felt; perceptible by the
      touch; as, a palpable form. --Shak.

            Darkness must overshadow all his bounds, Palpable
            darkness.                             --Milton.

   2. Easily perceptible; plain; distinct; obvious; readily
      perceived and detected; gross; as, palpable imposture;
      palpable absurdity; palpable errors. ``Three persons
      palpable.'' --P. Plowman.

            [Lies] gross as a mountain, open, palpable. --Shak.
      -- {Pal"pa*ble*ness}, n. -- {Pal"pa*bly}, adv.

Source : WordNet®

palpable
     adj 1: capable of being perceived by the senses or the mind;
            especially capable of being handled or touched or
            felt; "a barely palpable dust"; "felt sudden anger in
            a palpable wave"; "the air was warm and
            close--palpable as cotton" [syn: {tangible}] [ant: {impalpable}]
     2: can be felt by palpation; "a palpable tumor"